EP0873448B1 - Security paper - Google Patents
Security paper Download PDFInfo
- Publication number
- EP0873448B1 EP0873448B1 EP96942477A EP96942477A EP0873448B1 EP 0873448 B1 EP0873448 B1 EP 0873448B1 EP 96942477 A EP96942477 A EP 96942477A EP 96942477 A EP96942477 A EP 96942477A EP 0873448 B1 EP0873448 B1 EP 0873448B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibres
- polyvinyl alcohol
- watermark
- paper
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 44
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000004049 embossing Methods 0.000 claims abstract description 5
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920000297 Rayon Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 35
- 229920002994 synthetic fiber Polymers 0.000 description 11
- 229920000742 Cotton Polymers 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 240000000907 Musa textilis Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000347389 Serranus cabrilla Species 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
Definitions
- the invention relates to a method for the manufacture of security paper which are provided with high-quality watermarks.
- NL-A-9301835 discloses a procedure for manufacturing paper for security applications and in addition to cellulose fibres, uses insoluble polyvinyl alcohol fibres, or a quantity of soluble and insoluble polyvinyl alcohol fibres.
- the use of the insoluble polyvinyl alcohol fibres improves the strength and stiffness of the paper compared with paper containing only cellulose fibres.
- the paper in accordance with this patent publication exhibits better stiffness and definition of a watermark.
- the soluble polyvinyl alcohol fibres which may be used in accordance with the disclosure are those which dissolve in water at a temperature 60°C or higher and during the dissolving the soluble fibres disappear.
- the molecules of polyvinyl alcohol act as a binding agent and may provide a surface effect such that no normal surface treatment is required in order to provide a good print performance.
- the specification as a whole makes it clear that reasonable watermark quality is achieved even though a synthetic fibre is used, namely the insoluble polyvinyl alcohol fibres.
- this present invention is concerned with obtaining improved strength relative to security paper made from cellulosic fibres alone and also improved watermark quality relative to other types of insoluble PVOH fibre by the use of a certain amount cf polyvinyl alcohol fibres which have the ability to dissolve at temperatures of 95°C to 100°C.
- the mould made panel watermark is one of the most critical and important security features used in bank notes to deter forgery. This is clearly illustrated by the almost universal use of such watermarks throughout the world's currencies. It is critical to the counterfeit deterrent value of a watermark that it be of the highest quality.
- the background formation of the paper should be uniform.
- the dark area contrast is the easiest to quantify. This can be done by estimating the quantity of fibre in the higher grammage areas of the watermark in comparison to the non-watermarked area.
- the present invention provides a method for the manufacture of security paper, such as banknote paper, which method comprising forming a papermaking suspension comprising cellulosic fibres and polyvinyl alcohol fibres wherein the cellulosic fibres are present in an amount of at least 80% by weight of the total weight of the fibres in the suspension, characterized in that the polyvinyl alcohol fibres are soluble in water at temperatures of from 95°C to 100°C, insoluble below 95°C and are 3 to 5 mm in length, wherein a papermaking suspension comprising cellulosic fibres and the polyvinyl alcohol fibres is dewatered through an embossed wire mesh, wherein the embossing creates a profile of peaks and troughs corresponding to the light and dark areas of the watermark, and the formed paper with the watermark feature is thereafter dried to provide the resulting security paper.
- the cellulosic fibres comprise at least 80% by weight of the papermaking suspension and they may be both linter and comber fibres; additionally, fibres may be linen hemp or manila (abaca) fibres. It is preferred that cellulose fibres are present in an amount of at least 90% by weight.
- the polyvinyl alcohol fibres which are soluble in water at temperature of from 95°C to 100°C may be present in amounts of up to about 10% by weight and are preferably present in an amount of 2 to 10% and more preferably from 4 to 8% by weight based on the weight of the fibres in the papermaking suspension.
- the denier of the polyvinyl fibres which are soluble in water at temperatures of from 95° to 100°C may be up to 2 denier, or preferably 0.3 to 2 denier, and more preferably 1 denier.
- the polyvinyl alcohol fibres which are soluble in water at temperatures of from 95° to 100°C may have a core formed from some different polymeric fibre material, for example polyester, a polyamide viscose or a water-insoluble polyvinyl alcohol, These fibres with the core may be considered to be equivalent to normal polyvinyl alcohol fibres in that they provide a polyvinyl alcohol surface which is essential in the method according to this invention in order to obtain good strength properties as well as the good watermark which is for practical purposes an essential for high security documents especially banknotes.
- the polyvinyl alcohol fibres having the described core may be produced by a co-extrusion process or a 0.5 to 0.8 denier fibre tow of the core material may be passed through a bath of polyvinyl alcohol having a molecular weight of 50,000 to 150,000 wherein a coating of polyvinyl alcohol is applied to the fibre.
- the fibre is then dried and subsequently heat treated in order to increase the solubility of the polyvinyl alcohol to a value within the 95° to 100°C range, e.g. 99°C.
- the resulting tow fibre is then cut to produce a staple fibre length of say 5mm. Fibres produced in this way provide enhanced strength properties and improved bonding characteristics and also have a greatly reduced impact on the normal deterioration of watermark quality in comparison to their uncoated fibres.
- the polyvinyl alcohol fibres which are soluble in water at a temperature from 95°C to 100°C, because of their inherent lubricity, exhibit greatly improved mobility during the paper forming stage which in turn results in a markedly improved watermark quality when compared to paper containing insoluble polyvinyl alcohol fibres such as disclosed in said NL-A-9 301 835.
- a superior performance of the polyvinyl alcohol fibres required for the present process is clear from both the definition and contrast of watermarks made using these fibres.
- the fibre concentration is typically 0.2%, as is well known in the art. At this concentration, there is a natural tendency for the fibres to interact. For long fibres, such interaction results in the fibres clumping together. This clumping together may lead to flocculation and we have found that the tendency to clump or to flocculate is markedly less in dispersion of fibres as a result of the presence in the suspension of the polyvinyl alcohol fibres which are soluble in water at temperatures from 95° to 100°C in comparison to the insoluble fibres described in said NL-A-9 301 835.
- polyvinyl alcohol fibres which are soluble in water at temperatures of from 95° to 100°C can provide the benefit of both good strength properties in paper and superior watermark properties. This is a truly surprising combination of valuable properties and is not found when use is made of other water soluble polyvinyl alcohol fibres or insoluble (reinforcing) polyvinyl alcohol fibres.
- the preferred polyvinyl alcohol fibres for use in this invention are those produced by the process of wet spinning.
- a furnish was produced, containing 5% by weight on total dry fibre of 5mm, VPB102 PVOH fibres (soluble at 99°C, 5mm long) and 95% by weight cotton fibres prepared in the usual way. This was applied to an embossed mould on a paper machine for paper in the manner commonly used for banknote paper. The wet paper was then processed in the usual way through the following sequential processes: pressing, drying, polyvinyl alcohol impregnation, further drying, calendering and finally reeling.
- the paper thus produced was tested for doublefold and tear strength.
- the watermark was visually assessed according to the subjective criteria previously described. Paper made in exactly the same way but from a furnish comprising 100% by weight cotton fibre was also tested by way of comparison.
- One of the surprising aspects of the present invention is the distinct improvement in watermark quality achieved by fibres whose solubility is around 99°C compared to those that are insoluble such as the VPB103 fibres described in the above-mentioned Dutch patent application. This is illustrated by results from tests carried out on such fibres.
- VPB103 insoluble 3mm long
- VPB102 soluble at 99°C, 3mm long
- the assessment was divided into three categories, good, fair, poor as judged by one skilled in the art.
- the paper was produced on British Standard hand sheet machine and contained 5% by weight of PVOH fibres.
- the contrast achieved by the VPB102 relative to the VPB103 was 40% better for the portrait watermark and 100% better for the bar watermark. This is a truly remarkable and surprising difference in performance and illustrates clearly the benefit represented by the fibre selection identified in this patent application.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Developing Agents For Electrophotography (AREA)
- Burglar Alarm Systems (AREA)
- Surgical Instruments (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9600686 | 1996-01-12 | ||
GB9600686A GB2309039B (en) | 1996-01-12 | 1996-01-12 | Security paper |
PCT/GB1996/003120 WO1997025476A1 (en) | 1996-01-12 | 1996-12-18 | Security paper |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0873448A1 EP0873448A1 (en) | 1998-10-28 |
EP0873448B1 true EP0873448B1 (en) | 1999-11-03 |
Family
ID=10786990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96942477A Expired - Lifetime EP0873448B1 (en) | 1996-01-12 | 1996-12-18 | Security paper |
Country Status (26)
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2804447B1 (fr) * | 2000-02-01 | 2002-04-05 | Arjo Wiggins Sa | Papier comportant un filigrane a effet multiton et toile pour fabriquer ce papier |
FR2804448B1 (fr) * | 2000-02-01 | 2002-04-05 | Arjo Wiggins Sa | Papier de securite comportant une zone de securite, procede pour realiser un tel papier et dispositif pour mettre en oeuvre ce procede |
US6759001B2 (en) * | 2000-05-19 | 2004-07-06 | The Nippon Synthetic Chemical Industry Co., Ltd. | Method for producing embossed poly(vinyl alcohol) film |
SE516625C2 (sv) * | 2000-06-20 | 2002-02-05 | Holmen Ab | Säkerhetspapper/kartong och förfarande för framställning därav |
GB2382325B8 (en) * | 2001-11-26 | 2008-06-05 | Rue De Int Ltd | Improvements in paper |
DE10243653A1 (de) * | 2002-09-19 | 2004-04-01 | Giesecke & Devrient Gmbh | Sicherheitspapier |
DE10327083A1 (de) * | 2003-02-11 | 2004-08-19 | Giesecke & Devrient Gmbh | Sicherheitspapier und Verfahren zur Herstellung desselben |
GB2400075B (en) * | 2003-04-03 | 2005-03-02 | Rue De Int Ltd | Improvements in sheets |
GB0307755D0 (en) * | 2003-04-03 | 2003-05-07 | Rue De Int Ltd | Improvements in sheets |
US8012309B2 (en) * | 2007-01-12 | 2011-09-06 | Cascades Canada Ulc | Method of making wet embossed paperboard |
US20080169072A1 (en) * | 2007-01-12 | 2008-07-17 | Cascades Canada Inc. | Wet Embossed Paperboard and Method and Apparatus for Manufacturing Same |
JP2009057668A (ja) * | 2007-09-03 | 2009-03-19 | National Printing Bureau | 多層すき合わせ紙及びその製造方法 |
FR2922227B1 (fr) * | 2007-10-12 | 2009-12-18 | Arjowiggins Licensing Sas | Feuille comprenant au moins un filigrane observable que d'une face de la feuille |
CN101377063B (zh) * | 2008-10-13 | 2011-06-29 | 中国印钞造币总公司 | 造纸用增强纤维及其制备方法、以及含有该纤维的纸制品 |
CN101381975B (zh) * | 2008-10-15 | 2010-08-25 | 中国印钞造币总公司 | 一种透明纤维及其制备方法和含有该纤维的纸制品 |
FI121478B (fi) * | 2009-05-18 | 2010-11-30 | Sinoco Chemicals | Paperi- ja kartonkituotteiden lujuuden parantaminen |
BE1019219A3 (nl) * | 2010-05-28 | 2012-04-03 | Token Bvba B | Afbreekbaar betaal-, bewijs-of promotiemiddel. |
CN102418300B (zh) * | 2011-08-31 | 2013-06-26 | 保定钞票纸业有限公司 | 一种添加有防伪短纤维的防伪纸及其制造方法 |
RU2502842C1 (ru) * | 2012-11-23 | 2013-12-27 | Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") | Способ изготовления бумаги с охраняющим элементом, охраняющий элемент и способ его изготовления |
CN107407056A (zh) * | 2015-02-27 | 2017-11-28 | 特种东海制纸株式会社 | 包装用纸 |
WO2024008794A1 (en) * | 2022-07-06 | 2024-01-11 | Omya International Ag | In-situ patterning of fibre articles |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1616222A (en) * | 1922-05-18 | 1927-02-01 | American Writing Paper Company | Fourdrinier-wire screen |
GB895081A (en) * | 1959-02-27 | 1962-05-02 | Kurashiki Rayon Kk | Papers and unwoven cloths containing synthetic fibres of polyvinyl alcohol |
NL280757A (US07943777-20110517-C00090.png) * | 1961-07-10 | |||
DE1411338A1 (de) * | 1968-07-25 | 1969-01-30 | Huber Dr Otto | Poroeses kunststoffhaltiges Papier |
GB1283405A (en) * | 1969-08-13 | 1972-07-26 | Kuraray Co | A process for the production of water-resistant paper or non-woven fabric |
NL7907748A (nl) * | 1978-10-23 | 1980-04-25 | Kuraray Co | Polyvinylalcoholvezel en werkwijze voor het vervaardigen hiervan. |
US4534398A (en) * | 1984-04-30 | 1985-08-13 | Crane & Co. | Security paper |
JPH07113199B2 (ja) * | 1987-04-16 | 1995-12-06 | ユニチカ株式会社 | 再分解性紙 |
IN173621B (US07943777-20110517-C00090.png) * | 1987-12-04 | 1994-06-18 | Portals Ltd | |
NL9301835A (nl) * | 1993-10-22 | 1995-05-16 | Vhp Ugchelen Bv | Werkwijze ter vervaardiging van papier dat bestemd is voor waardepapieren en uit dit papier verkregen waardepapieren. |
-
1996
- 1996-01-12 GB GB9600686A patent/GB2309039B/en not_active Revoked
- 1996-12-18 CN CN96199591A patent/CN1085277C/zh not_active Expired - Fee Related
- 1996-12-18 UA UA98073701A patent/UA49870C2/uk unknown
- 1996-12-18 EP EP96942477A patent/EP0873448B1/en not_active Expired - Lifetime
- 1996-12-18 AT AT96942477T patent/ATE186344T1/de not_active IP Right Cessation
- 1996-12-18 CZ CZ19982170A patent/CZ291599B6/cs not_active IP Right Cessation
- 1996-12-18 RU RU98114993/12A patent/RU2159826C2/ru not_active IP Right Cessation
- 1996-12-18 CA CA002242551A patent/CA2242551C/en not_active Expired - Fee Related
- 1996-12-18 KR KR10-1998-0705318A patent/KR100374896B1/ko not_active IP Right Cessation
- 1996-12-18 WO PCT/GB1996/003120 patent/WO1997025476A1/en active IP Right Grant
- 1996-12-18 TR TR1998/01264T patent/TR199801264T2/xx unknown
- 1996-12-18 DE DE69605059T patent/DE69605059T2/de not_active Expired - Lifetime
- 1996-12-18 BR BR9612585A patent/BR9612585A/pt not_active IP Right Cessation
- 1996-12-18 HU HU9903866A patent/HUP9903866A3/hu unknown
- 1996-12-18 PL PL96327661A patent/PL185971B1/pl not_active IP Right Cessation
- 1996-12-18 JP JP9524936A patent/JP2000503077A/ja active Pending
- 1996-12-18 US US09/101,042 patent/US6063239A/en not_active Expired - Fee Related
- 1996-12-18 ES ES96942477T patent/ES2140916T3/es not_active Expired - Lifetime
- 1996-12-18 AU AU11855/97A patent/AU715428B2/en not_active Ceased
-
1997
- 1997-01-06 IN IN30CA1997 patent/IN189655B/en unknown
- 1997-01-08 TW TW086100152A patent/TW344772B/zh active
- 1997-01-09 EG EG2697A patent/EG21483A/xx active
- 1997-01-09 ID IDP970038A patent/ID15823A/id unknown
- 1997-01-10 ZA ZA9700212A patent/ZA97212B/xx unknown
-
1998
- 1998-07-07 BG BG102604A patent/BG62979B1/bg unknown
- 1998-07-10 MX MX9805632A patent/MX9805632A/es not_active Application Discontinuation
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